49638221 has 2 divisors, whose sum is σ = 49638222. Its totient is φ = 49638220.

The previous prime is 49638191. The next prime is 49638247. The reversal of 49638221 is 12283694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48846121 + 792100 = 6989^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 49638221 - 2²² = 45443917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49638271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24819110 + 24819111.

It is an arithmetic number, because the mean of its divisors is an integer number (24819111).

Almost surely, 2^49638221 is an apocalyptic number.

It is an amenable number.

49638221 is a deficient number, since it is larger than the sum of its proper divisors (1).

49638221 is an equidigital number, since it uses as much as digits as its factorization.

49638221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 49638221 is about 7045.4397307762. The cubic root of 49638221 is about 367.5124613603.

The spelling of 49638221 in words is "forty-nine million, six hundred thirty-eight thousand, two hundred twenty-one".